The 2 and 3 BAR sensors have a unique key system in the connector. If the center socket has a vertical key in it, its a 2 or 3 BAR sensor. If there is no key in the center socket its a 1 BAR. Orientation when mounting is important. Mount so the nipple is facing <30 degrees from down so as to prevent moisture from pooling from condensation. Also recommended to mount higher than intake. I found a 2 BAR MAP on a supercharged Pontiac Bonneville. They are not that uncommon in US junkyards. Its mounted right behind the supercharger on a bracket, just follow the hard pressure line from under the pulley and is held on by a T20 torx bolt but a good pair of pliers can grip the bolt and unscrew as the torque spec is low to prevent deformation of the case.

5.1 is a terrible choice as they're probably ratiometric. But as long as you record your exact voltage, it's fine. Aim for 5.000000 :-p I've seen 5.05 and 5.01 and 4.99 out of these regs. Moving this thread to general hw, too.

719 1 bar sensor in in-HG vac taken at 70F with reference voltage 5.11. (as close as I could get to 5.00 with what I had) 23 in .78v22 in .9121 in 1.0520 in 1.2219 in 1.4118 in 1.6317 in 1.7816 in 1.9815 in 2.1614 in 2.3613 in 2.5412 in 11 in 2.8910 in 3.089 in 3.278 in 3.467 in 3.666 in 3.865 in 4.064 in 4.263 in 4.462 in 4.670 in 5.00

2 bar 539 map 23 in22 in .4521 in .5420 in .6119 in .7018 in .7817 in .8616 in .9515 in 1.0414 in 1.1213 in 1.2112 in 1.3011 in 1.3810 in 1.469 in 1.558 in 1.647 in 1.736 in 1.835 in 1.974 in 2.013 in 2.112 in 2.220 in 2.37No boost data yet, trying to figure how Ill pressurize it with an accurate gauge.

After sleeping on it, I realized the 0 output on the 1 BAR is exactly 5.00V. Ill use that as the source voltage and retest the 2 BAR map and see if the voltages are truly proportional with the input voltage, along with a little boost pressure sample from a hand pump.

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